All flours other than 1OO% Wholemeal must have a specified amount of chalk added to them. This became law following an outbreak of rickets in Dublin in 1941. In addition to the chalk it is compulsory to add certain specified amounts of Iron, Thiamin (vitamin B1) and Nicotinic Acid to all flours other than wholemeal. Some consider that this is little more than a token attempt to make up for the many items missing from flour that is not wholemeal.
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